Opera has released an alpha build of their upcoming 9.5 release. "Following the release of Opera 9 last year, we re-wrote Opera's rendering engine for the coming Opera 9.5 release. As a result, Opera 9.5 contains more than a year's worth of speed, standards and performance improvements."

Firefox was not only able to build a stronger brand and a larger extention ecosystem, but embedded developers are using the Firefox codebase to build specialized web environments without paying for Opera. If that wasn't enough to contend with, WebKit has enormous momentum behind it now that Apple and KDE are reunited.

But none of those matter to the general user. Firefox got momentum because geeks of all stripe and by whatever means pushed it out to friends, and friends of friends, and so on.